What is the future of engines? Is the current internal combustion engine only as good as it is now? I hope the professionals to discuss

The future development of the engine civilian or power-based, but the bottleneck is the battery and permanent magnet materials, room temperature superconducting coils. Because electricity as an energy source is clean and efficient, and the future fusion reaction energy is in the form of electricity output, so the civilian project is generally to use electricity as an energy source. Now the battery can not break through, if the use of hydrogen-nickel fuel storage of hydrogen is a problem, now the hydrogen storage is generally generated metal hydride. If carbon nanorods are the storage material, more can be stored. Large motors need good permanent magnets, the future may utilize neodymium iron boron, samarium iron boron magnets for the motor permanent magnet material as a stator, and once the discovery of room temperature superconducting coils can be obtained with large current and low power loss, once the above problems are solved, you can make large motors.